Cov muaj pes tsawg leeg ntawmS355J0 wb(Ib puag ncig cov qauv hlau raws li EN 10025-5) ua tib zoo sib npaug kom xazoo low-temperature impact toughness(yam tsawg kawg27j0 qibrau J0 qib) thaum tuav lub zog siab thiab atmospheric corrosion kuj. Hauv qab no yog cov ncauj lus kom ntxaws txog yuav ua li cas txhua lub ntsiab lus tseem ceeb cuam tshuam rau nws qhov kub thiab txias toughness:
1. Cov pa roj carbon (C): Tsawg dua lossis sib npaug li 0.12% (tswj nruj)
nyhuv: Cov pa roj carbon monoxide yog qhov tseem ceeb ntxiv dag zog, tab sistshaj C drastic txo qis-kub toughnesslos ntawm kev txhawb zog, brittle microstructures (pearlite, martensite) thiab ua kom cov ductile-to-brittle hloov kub (DBTT).
Tsim kev xaiv: Tsawg C (< 0.12 %) minimizes embrittlement, preserves ductility, and improves weldability-critical for maintaining toughness in thick sections and welded joints.
2. Manganese (Mn): 0.50-1.50%
nyhuv: Muaj txiaj ntsig zoorau low-temperature toughness.
Mnrefines ferrite nplejthiab suppresses tus tsim ntawm ntxhib pearlite.
Nwsneutralizes teeb meem sulfurlos ntawm kev tsim MnS suav nrog (tshwj tsis yog FeS), uas txo qis qhov kub thiab txhim kho qhov kub thiab txias ductility.
Mn txo qis DBTT thiab txhawb kev cuam tshuam lub zog ntawm subzero kub.
Kev lag luam tawm: Too high Mn (>1.6%) tuaj yeem ua kom tawv tawv thiab muaj kev pheej hmoo ntawm cov qauv banded, uas tuaj yeem ua rau cov tawv nqaij tawv.
3. Silicon (Si): 0.25-0.75%
nyhuv: Nruab Nrab Si pab deoxidation thiab ntxiv dag zog rau matrix ntawm solid-solution hardening.
Toughness cuam tshuam: Nruab nrab rau me ntsis tsis zoontawm qhov kub thiab txias.
Excess Si (>0.8%) txhawb nqa brittle ferrite thiab tuaj yeem nce DBTT.
S355J0WP txwv Si rau qhov nqaim kom sib npaug zog thiab toughness.
4. Phosphorus (P): 0.06-0.15% (tseem ceeb rau huab cua hlau)
nyhuv:P yog atseem ceeb weathering elementuas ua kom nrawm tsim cov patina tiv thaiv (-FeOOH).
Toughness txaus ntshai: Muaj zog embrittling ntawm qhov kub thiab txias.
P cais rau cov ciam teb, txo cov kev sib koom ua ke, thiabho nce DBTT.
S355J0WP siv atswj P qib(siab dua li cov pa roj carbon monoxide, tab sis capped) kom txhim kho corrosion tsis kam tsis muaj kev puas tsuaj los ntawm kev nyuaj siab.
5. Sulfur (S): Tsawg dua lossis sib npaug li 0.030% (qhib txwv)
nyhuv: Kev puas tsuaj loj heevrau toughness.
S cov ntawvelongated MnS suav nroguas ua raws licrack pibnyob rau hauv kev cuam tshuam, tshwj xeeb tshaj yog nyob rau hauv qis kub.
Nws ua raukub luvthiab txo transverse toughness.
Tswj: S khaws cia tsawg dua lossis sib npaug li 0.03% (feem ntau Tsawg dua lossis sib npaug rau 0.02% hauv kev xyaum) kom txo qis kev puas tsuaj.
6. Tooj liab (Cu): 0.25-0.55%
nyhuv: Cov huab cua tseem ceeb; tsim ib ntom, adherent xeb txheej.
Toughness cuam tshuam: Feem ntau nruab nrab lossis me ntsis txiaj ntsig.
Cu tsis embrittle ntawm qhov kub thiab txias thiab tuaj yeem ua kom zoo dua microstructure.
Nws txhim kho corrosion tsis kam tsis raug nplua toughness nyob rau hauv cov kev teev tseg.
7. Chromium (Cr): 0.30-1.25%
nyhuv: Txhim kho huab cua tsis kam thiab stabilizes tiv thaiv patina.
Toughness cuam tshuam: Yooj yim zoonyob rau theem qis.
Cr refines nplej thiab ntxiv dag zog rau cov matrix yam tsis muaj qhov tseem ceeb embrittlement hauv S355J0WP qhov ntau.
Excess Cr (>1.5%) tuaj yeem ua kom tawv tawv thiab muaj kev pheej hmoo ntawm nkig theem.
8. Nickel (Ni): Tsawg dua lossis sib npaug li 0.65% (yeem tab sis feem ntau ntxiv)
nyhuv: Qhov zoo tshaj plaws alloying ntsiab rau kev txhim kho qis-kub toughness.
Niqis dua DBTT, nce kev cuam tshuam lub zog ntawm subzero kub, thiab stabilizes ferrite theem tiv thaiv embrittlement.
Nws kuj boosts corrosion kuj nyob rau hauv industrial / ntug dej hiav txwv ib puag ncig.
Lub luag haujlwm hauv S355J0WP: Ni yog suav nrog los tiv thaiv cov nyhuv embrittling ntawm phosphorus thiab xyuas kom cov hlau ua tau raws li J0 (0 degree) toughness.
9. Microalloying (Nb, V, Ti, Al): kab kawm qib
nyhuv: Zoo heevrau toughness ntawmnplej refinement.
Al deoxidizes thiab tsim AlN rau pin austenite nplej.
Nb, V, Ti daim ntawv nplua carbides / nitrides uas tiv thaiv kev loj hlob ntawm cov nplej thaum lub sij hawm kub dov, ua ib tug nplua, uniform ferrite-pearlite microstructure -ib qho tseem ceeb tshaj plaws rau qhov zoo ntawm qhov kub thiab txias toughness.
